The plan, according to Arpaio, was that the three people arrested by the MCSO Monday night were using Craigslist to find a dog to "fornicate" with the woman, while her husband and friend watched.

The sheriff's office says all three of the suspects -- Shane Walker, 38, Sarah Dae Walker, 33, and Robert Aucker, 29 -- showed up to the predetermined location, where they met an undercover detective and his male Golden Shepherd mix.